Add a workflow to close stale issues

Summary: If the proxygen team needs author input to progress an issue, we will mark it need-input.  If an issue has been marked need-input with no action from the author in 2 weeks, the issue will auto close.

Reviewed By: kvtsoy

Differential Revision: D62988294

fbshipit-source-id: 085d57a0d99c4501f465f87b1b83ee109081cca7

third-party/proxygen/src/.github/workflows/close_stale.yml

@@ -0,0 +1,21 @@
+name: Close inactive issues
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  close-issues:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+    steps:
+      - uses: actions/stale@v5
+        with:
+          days-before-issue-stale: -1
+          days-before-issue-close: 14
+          stale-issue-label: "need-input"
+          stale-issue-message: "This issue is stale because it has been open too long with no activity."
+          close-issue-message: "This issue was closed because it has been inactive for two weeks since being marked as need-input."
+          days-before-pr-stale: -1
+          days-before-pr-close: -1
+          repo-token: ${{ secrets.GITHUB_TOKEN }}